Bump extension version to v0.8.9 #11202

Job	Run time
lint_node	44s
lint_ruby	21s
build_node (ubuntu-latest)	1m 14s
Ruby 3.1 on ubuntu-latest	16m 12s
build_node (macos-latest)	1m 31s
Ruby 3.2 on ubuntu-latest	15m 1s
spelling	15s
build_node (windows-latest)	4m 43s
Verify Jekyll website builds	7s
Ruby 3.3 on ubuntu-latest	10m 7s
Ruby 3.1 on macos-latest	9m 29s
Ruby 3.2 on macos-latest	8m 41s
Ruby 3.3 on macos-latest	7m 14s
Ruby 3.1 on windows-latest	22m 37s
Ruby 3.2 on windows-latest	19m 7s
Ruby 3.3 on windows-latest	25m 41s
	2h 23m 4s

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